High-pressure vacuum grease gun



May 17, 1927.

M. A. FRANK HIGH PRESSURE VACUUM GREASE GUN Filed Jan. 25, 1926 INVENTOR. .Jfi'ilonfli'ranh 6 BY f V mi v 14, TTORNEY.

MILTON A. FRANK, OF SAN FRANCISCO, CALIFORNIA.

HIGH-PRESSURE VACUUM GREASE GUN.

Application filed January 25, 1926. Serial No. 83,490.

This invention relates to a high vacuum grease gun, the ob ect of pressure which is to provide means whereby a charge of grease is used in the gun,

may be easily applied thereto, and fed therefrom under a sufliciently high pressure to clean out the bearing to which the grease is applied.

grease fresh charges of the The several for the gun are contained within a collapsible lead tube such as is commonly supplied to thetrade.

Another object of the invention is to provide means whereby the collapsible tube may be protected during the time the grease is being used therefrom, casing serves as one creating mechanism.

while the protecting handle of the pressure Another object of-the invention is to provide means whereby the grease gun will be supplied with grease by a vacuum created by the plunger used for creating the high pressure on the forward stroke of the piston.

Another object of the invention is to provide a grease gun of this type which may be applied to several different kinds of high pressure grease fittings. An embodiment of 1n the accompanying the invention is shown drawings 1n which the same reference numeral is applied to the same portion throughout the several figures of the drawings, and of which there may be modifications.

Figure 1 is a longitudinal sectional view of the complete grease gun, v

Figure 2 is a bottom plan view of the Figure 3 is a'vertical sectional view of a base as used in connection with a type of fitting which simply requires the grease gun to be pressed against the fitting, and,

Figure 4; is a bottom tlngs shown 1n Flgure 3.

plan view of the fit- The grease gun is built upon a base 1, which has a threaded flange at 2 to receive the cover 3. The

to receive the threaded end 6 grease tube 6.

base is also threadedat t of a soft lead ber 6' by means, of

a larger tubular end 9.

The object of the tube 8 is to prevent the lead tube from collapsing as to prevent the escape of in such a manner grease therefrom.

Transversely extending across the base 1 there 1s a bore which receives a small plunger ,10, and in one end of which the threaded fit- The plunger 10 has a yoke 15 which is pivotally connected at 16 to the lever 17.

This lever is pivotally connected at 18 to a link 19, which in turn, is pivotally connected to lugs 20 by means of the pin 21.

Immediately under the center tube 8, there is an opening into the bore fittingthe piston rod 10, and when the piston 10 is pulled to its outermost position the ball 12 will prevent air from getting into the chamber in which the rod 10 operates, so this will cause a sufficient vacuum to draw the space left vacant by the withdrawal of the rod 10, and when the pressure is appliec thereto the rod 10 will almost instantly out oif the communication with the hole 22, and thereby force the grease through the pipe 14 at a pressure of several thousand pounds per square inch depending upon the resistance offered. The cover 3 is open to the atmosphere at 8. It will be seen that the lead nozzle of the tube 6 is forced down into the threaded opening in the base 1 sufiiciently tight. to prevent any access'of air to the chamber in which the rod 10 is movable, an thereby to cause afresh charge of grease to be forced by the atmosphere into the gun bot-(e1 ahead of the plunger 10 each time it is use 1 In the event that it is desired to use a type of greasing device similar to that of those grease guns which operate by simply pushing the grease gun against the high-pressure fixture the type of base shown in Figure 3 may be used. This consists of a has a series of holes in it to allow the pas- I the grease intoflangedbase 30 to receive the cover 3 and lead tube of sage therethrough of the grease. and this base carries the small piston 33. This piston has a spring 34- surrounding itwhich holds the tubular member 35 in the position shown in Figure 3 normally, a collar 36 preventing the grease from passing beyond the threaded llO bushing 37, and preventing the tube 35 from passing out of the said bushing.

' The end of the rod 33 is arranged so that I it barely passes the hole 38 and at the other bearings. This member end of the tube it has the threaded fitting 39 which fits the greasing fixture on the 39 holds the spring 40 in place, and the spring holds the valve 41 in place.

In the event that a person desires to make use of the grease gun its flaring opening 42 in the fitting 39 is pressed on the greasing fitting and pressure is applied to the opposite end of the grease gun. This allows the tube 35 to slide on the istonrod 33 and thereby expel the desire charge ofgrease from the gun.

It Will be seen that this grease gun dispenses entirely with the use of grease en masse in the cover 3, and substitutes therefor a convenient tube of'greasc which can be screwed into connection with the grease gun base for use therein.

The plunger 33 has a perforated and flanged base 33' to hold it straight in the bore 31 of the head 30. It will be clear that the only object of the tube 8 is to'provide access to the threaded nozzle 6' of the grease tube 6 for the grease at all times, regardless of the collapsed condition of the lead tube and that itmay be made of any desired kind of foraminous material either a tube or a screen. I

Having thus described my invention, what I desire to secure by Letters Patent of the United States is as follows, but modifica tions may. be made in carrying out the invention as shown in the drawings and in the- 1. A high pressure grease gun comprising a base, means to expel successive charges of grease therefrom at .high pressure, an up wardly projecting rigid cover detachably secured to said base, leading from said expelling means to the interior of said cover, a socket about said passaget'or supporting a grease receptacle.

2. A high pressure grease gun comprising a base, means to expel successive charges of grease therefrom at high pressure, an upwardly projecting rigid cover detachably secured to said base, a passage in said base leading from said expelling means to the interior of said cover, a socket about said passage for supporting a grease receptacle and a perforated tube supported in said socket and adapted to project up into the grease receptacle.-

In testimony whereof I have hereunto set my hand this 19" day of January A. D. 1926.

MILTON A. FRANK.

a passage in said base 

